<style>
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

    body {
        background: #f0f2f5;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
    }

    .header {
        background: linear-gradient(135deg, #6366f1, #3b82f6);
        color: white;
        padding: 1.5rem;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        text-align: center;
    }

    .logo { 
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 1.5rem;
        margin-bottom: 1rem;
    }

    .logo-img {
        height: 70px;
        filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    }

    .logo-text {
        font-size: 2.5rem;
        font-weight: bold;
        letter-spacing: 2px;
    }

    .slogan-container {
        display: flex;
        flex-direction: column;
        gap: 0.3rem;
    }

    .slogan {
        font-size: 0.9rem;
        opacity: 0.9;
    }

    .container {
        max-width: 1200px;
        margin: 2rem auto;
        padding: 0 1rem;
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .login-box {
        background: white;
        padding: 2.5rem;
        border-radius: 15px;
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
        width: 100%;
        max-width: 420px;
        margin: 0 auto;
    }

    .login-box h2 {
        text-align: center;
        color: #333;
        margin-bottom: 2rem;
        font-weight: 500;
        font-size: 1.8rem;
    }

    .input-group {
        margin-bottom: 1.5rem;
        position: relative;
    }

    .input-group i {
        position: absolute;
        left: 1rem;
        top: 50%;
        transform: translateY(-50%);
        color: #666;
        z-index: 2;
    }

    .input-group input {
        width: 90%;
        padding: 1rem 1rem 1rem 3rem;
        border: 1px solid #ddd;
        border-radius: 8px;
        font-size: 1rem;
        transition: all 0.3s ease;
        background: #fafafa;
    }

    .input-group input:focus {
        outline: none;
        border-color: #6366f1;
        background: white;
        box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    }

    .btn-login {
        width: 100%;
        padding: 1rem;
        border: none;
        border-radius: 8px;
        background: #6366f1;
        color: white;
        font-size: 1.1rem;
        font-weight: bold;
        cursor: pointer;
        transition: all 0.3s ease;
        margin-top: 0.5rem;
    }

    .btn-login:hover {
        background: #4f46e5;
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }

    .certification {
        text-align: center;
        margin-top: 2rem;
        color: #666;
        font-size: 0.9rem;
        padding-top: 1rem;
        border-top: 1px solid #eee;
    }

    /* Responsive adjustments */
    @media (max-width: 480px) {
        .login-box {
            padding: 2rem 1.5rem;
            margin: 1rem auto;
        }
        
        .container {
            margin: 1rem auto;
            padding: 0 0.5rem;
        }
        
        .input-group input {
            padding: 0.875rem 0.875rem 0.875rem 2.5rem;
        }
        
        .input-group i {
            left: 0.75rem;
        }
    }
</style>